CN111458662A - A wireless communication transformer winding deformation frequency response method detection computing system and method - Google Patents

Abstract

The invention discloses a wireless communication transformer winding deformation frequency response method detection and calculation system and method. The system includes: a host computer control unit and a lower computer detection unit; the host computer control unit includes a host computer command module and a host computer. a wireless communication module; the lower computer detection unit includes a lower computer wireless communication module, a frequency sweep signal generation module, a signal processing module and a signal calculation module; the upper computer instruction module is converted into an upper computer instruction according to user needs; The upper computer instruction is sent to the lower computer detection unit; the lower computer detection unit is connected with the transformer winding load to be detected, and the lower computer detection unit has a detection operation function, and the collection and calculation of the load output signal are uploaded to the upper computer. Perform detection and analysis; the system and method avoid long-distance wiring, and avoid the problems of low detection accuracy and consistency and low detection efficiency in the prior art.

Description

A wireless communication transformer winding deformation frequency response method detection computing system and method

technical field

The invention relates to the field of electric power technology, and more particularly, to a wireless communication transformer winding deformation frequency response method detection and calculation system and method.

Background technique

The power transformer is the key core equipment of the power system, and the amount of equipment installed in the power grid system is huge, and its operational reliability is directly related to the power supply security of the power system. However, in recent years, transformer winding deformation faults occur frequently, ranking first in transformer faults. According to incomplete statistics, transformer winding deformation faults account for 33.8% of all transformer faults. Frequent transformer winding deformation faults have led to great concerns about equipment reliability, especially as the scale of the power system becomes larger and larger, the capacity becomes higher and higher, the short-circuit current level of the system increases year by year, and the hidden danger of transformer winding deformation faults becomes more prominent. After a short circuit, how to quickly and effectively detect whether the transformer winding is deformed and avoid the transformer failure has become a key concern of the operation and maintenance unit, which needs to be solved urgently.

Frequency response method is currently recognized as the most effective technical means to detect winding deformation, and has achieved good application results in offline detection of transformer winding deformation. However, the existing application of the frequency response method has the following problems:

(1) The detection accuracy and consistency are low. In the prior art, the signal generation and collection point is too far from the test point of the transformer under test, usually a spatial distance of 10 to 20 meters. The two are connected by a long coaxial cable, and the shielding layer of the coaxial cable is connected by a long-distance grounding wire. Connect to ground. Since the high-frequency signal is greatly affected by the spatial coupling interference when it propagates in the long-distance transmission line, the measured high-frequency signal is seriously attenuated and distorted, which affects the accuracy of the calculation results. At the same time, the on-site wiring environment is relatively complex, and it is difficult to ensure that the direction and position of the signal connection are completely consistent for each test of the same sample. The effect of stray parameters on the test results is different in each test, resulting in low test consistency.

(2) The detection efficiency is low. A large number of long-distance cables and power supply systems are required for detection in the prior art, the system structure is complex and the wiring is cumbersome, resulting in excessive time-consuming for wiring and disconnection during the detection process, which seriously reduces the detection efficiency.

(3) The detection range is difficult to expand. In the existing detection technology, the algorithm is concentrated in the upper computer, the detection circuit is concentrated in the lower computer, the algorithm is separated from the detection circuit, and all the original detection data must be uploaded to the upper computer for unified operation. This mode leads to excessive redundancy of detection data, and it is difficult to expand the detection range of a single machine.

SUMMARY OF THE INVENTION

In order to solve the problems of complicated wiring, low detection accuracy and consistency, and low detection efficiency in the existing detection methods and devices in the background technology in field applications, the present invention provides a transformer winding deformation frequency response method for wireless communication A detection operation system and method, the system and method realize the interaction between an on-site detection device and a host computer control unit through a wireless network, and sink the detection operation into a hardware detection circuit, so that signal acquisition, data processing and calculation are all realized on-site, The wireless communication transformer winding deformation frequency response method detection and calculation system includes:

The upper computer control unit and the lower computer detection unit; the upper computer control unit includes the upper computer command module and the upper computer wireless communication module; the lower computer detection unit includes the lower computer wireless communication module, the frequency sweep signal generation module, and the signal processing module and signal calculation module;

The host computer command module is used to receive the user's control request information and convert it into a preset host computer command; the host computer command unit is connected with the host computer wireless communication module; the host computer command module passes the The upper computer wireless communication module sends the upper computer instruction to the lower computer detection unit; the upper computer instruction includes frequency sweep signal information;

The upper computer wireless communication module and the lower computer wireless communication module are used to establish a communication channel for data transmission through a preset wireless communication protocol;

The output end of the frequency sweep signal generating module is connected to the input end of the transformer winding load to be detected; the input end of the signal processing module is connected to the output end of the transformer winding load to be detected;

The frequency sweep signal generating module obtains the frequency sweep signal information in the command of the upper computer through the wireless communication module of the lower computer, generates the frequency sweep signal according to the frequency sweep signal information and outputs it to the transformer winding load;

The signal processing module has two input ends, which are respectively connected with the two output ends of the transformer winding load to be detected;

The signal processing module is used to preprocess the two output signals of the transformer winding load to be detected according to a preset rule, and transmit the preprocessed two output signals to the signal calculation module. input;

The signal calculation module is used to calculate and obtain detection parameters according to the two input signals and preset rules, and upload the detection parameters to the upper computer control unit through the lower computer wireless communication module;

The upper computer control unit is configured to analyze the detection parameter according to a preset analysis method, and obtain the detection result of the transformer winding deformation.

Further, the frequency sweep signal information includes the frequency sweep signal information including the signal peak value, the frequency sweep start frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the number of frequency sweep points;

The signal peak value, the frequency sweep start frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control request information determined by the user within the corresponding preset parameter interval.

Further, the frequency sweep mode includes a linear frequency sweep mode and a logarithmic frequency sweep mode;

The host computer instruction module is used to determine the frequency array according to the frequency sweep start frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the number of frequency sweep points;

The frequency sweep signal generating module sequentially generates the frequency sweep signal according to the frequency values in the frequency array;

When the frequency sweep mode is a linear frequency sweep mode, the calculation mode of the frequency array is:

When the frequency sweep mode is a logarithmic frequency sweep mode, the calculation mode of the frequency array is:

Among them, f ₂ is the cut-off frequency of the sweep, f ₁ is the start frequency of the sweep, N is the number of sweep points, i is the number of sweeps, i=0, 1, 2...N-1.

Further, the signal processing module includes a bandpass filter submodule and an AD acquisition submodule;

The band-pass filtering sub-module is used to filter the two output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands, and obtain the filtered two output signals;

The AD acquisition sub-module is used to perform AD conversion on the filtered output signal to obtain two digital output signals.

Further, the upper computer instruction includes filtering control information; the band-pass filtering sub-module is used to determine whether to perform band-pass filtering according to the filtering control information; if it is determined not to perform band-pass filtering, then the original two The output signal of the channel is transmitted to the AD acquisition sub-module.

Further, the signal processing module also includes a range adjustment sub-module;

The range adjustment sub-module is used for judging whether the acquisition range of the search output signal needs to be adjusted according to a preset judgment method;

The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset ratio range of the current range, range adjustment is not required; if the signal peak value is high If the peak value of the signal is lower than the preset ratio range of the current range, the range is lowered according to the preset ratio.

Further, the detection parameter calculated by the signal calculation module includes an amplitude-frequency parameter and a phase-frequency parameter;

The calculation formula of the amplitude-frequency parameter H is:

H=20lg(V ₂ /V ₁ )

The calculation formula of the phase-frequency parameter C is:

C=θ ₂ -θ ₁

Among them, H is the amplitude-frequency parameter; V ₁ is the peak-to-peak value of the waveform collected by the first channel; V ₂ is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ ₁ is the waveform collected by the first channel. Initial phase; θ ₂ is the initial phase of the waveform collected by the second channel.

Further, the lower computer detection unit also includes a storage module and a process control module;

The storage module is configured to associate and store the detection parameter and the current frequency calculated by the signal calculation module;

The process control module is used for judging whether the frequency sweeping process ends according to the current frequency and the frequency sweeping cut-off frequency; when judging that the frequency sweeping process ends, uploading multiple sets of detection parameters stored in the storage module to the upper machine control unit;

The process control module is used to generate a process instruction after calculating and obtaining each set of detection parameters; when the frequency sweep process is not over, the process instruction includes the current frequency value; when the frequency sweep process ends, the process instruction The process command is a preset process command representing the end of the frequency sweep;

After the upper computer control unit receives the process instruction representing the end of the frequency sweep, it receives multiple sets of inspection parameters.

The wireless communication transformer winding deformation frequency response detection and calculation method includes:

Receive the user's control request information, and generate a host computer command; the host computer command includes frequency sweep signal information;

The upper computer command is transmitted to the lower computer detection unit through a wireless communication method; the frequency sweep signal is generated by the frequency sweep signal information of the upper computer command and output to the transformer winding load;

Collecting the two output signals of the transformer winding load to be detected, preprocessing the two output signals, and obtaining the preprocessed two output signals;

Calculation and acquisition according to the preprocessed two-way output signals and calculation and acquisition of detection parameters according to preset rules;

The detection parameters are uploaded to the host computer control unit through a wireless communication method; the detection parameters are analyzed according to a preset analysis method to obtain the transformer winding deformation detection results.

Further, the frequency sweep signal information includes the frequency sweep signal information including the signal peak value, the frequency sweep start frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the number of frequency sweep points;

The signal peak value, the frequency sweep start frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control request information determined by the user within the corresponding preset parameter interval.

Further, the frequency array is determined according to the frequency sweep start frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the number of frequency sweep points; the frequency sweep mode includes a linear frequency sweep mode and a logarithmic frequency sweep mode;

The frequency sweep signal is sequentially generated according to the frequency values in the frequency array;

When the frequency sweep mode is a linear frequency sweep mode, the calculation mode of the frequency array is:

When the frequency sweep mode is a logarithmic frequency sweep mode, the calculation mode of the frequency array is:

Among them, f ₂ is the cut-off frequency of the sweep, f ₁ is the start frequency of the sweep, N is the number of sweep points, i is the number of sweeps, i=0, 1, 2...N-1.

Further, preprocessing the two output signals to obtain the preprocessed two output signals, including:

The band-pass filtering sub-module is used to filter the two output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands, and obtain the filtered two output signals;

The AD acquisition sub-module is used to perform AD conversion on the filtered output signal to obtain two digital output signals.

Further, preprocessing the two output signals also includes:

The host computer instruction includes filtering control information;

Whether to perform band-pass filtering is determined according to the filtering control information; if it is determined not to perform band-pass filtering, the original two-channel output signals are substituted for the filtered two-channel output signals.

Further, according to the preset judgment method, it is judged whether the acquisition range of the search output signal needs to be adjusted;

The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset ratio range of the current range, range adjustment is not required; if the signal peak value is high If the peak value of the signal is lower than the preset ratio range of the current range, the range is lowered according to the preset ratio.

Further, the detection parameters include amplitude-frequency parameters and phase-frequency parameters;

The calculation formula of the amplitude-frequency parameter H is:

H=20lg(V ₂ /V ₁ )

The calculation formula of the phase-frequency parameter C is:

C=θ ₂ -θ ₁

Among them, H is the amplitude-frequency parameter; V ₁ is the peak-to-peak value of the waveform collected by the first channel; V ₂ is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ ₁ is the waveform collected by the first channel. Initial phase; θ ₂ is the initial phase of the waveform collected by the second channel.

Further, the detection parameters calculated by the signal calculation module and the current frequency are associated and stored;

According to the current frequency and the frequency sweep cut-off frequency, it is judged whether the frequency sweeping process is over; when it is judged that the frequency sweeping process is over, the multiple sets of detection parameters stored in the storage module are uploaded to the host computer control unit together;

After calculating and obtaining each set of detection parameters, a progress command is generated; when the frequency sweep process is not over, the progress command includes the current frequency value; when the frequency sweep process ends, the progress command is a preset representative The process command for the end of the sweep.

The beneficial effects of the present invention are as follows: the technical scheme of the present invention provides a wireless communication transformer winding deformation frequency response method detection and calculation system and method, the system and method realize the on-site detection device and the host computer control unit through the wireless network The system and method avoid long-distance wiring and low detection accuracy and consistency in the prior art , The problem of low detection efficiency, and at the same time, an edge computing network composed of a host computer and multiple subordinate computers can be formed, which greatly expands the detection range.

Description of drawings

Exemplary embodiments of the present invention may be more fully understood by reference to the following drawings:

1 is a structural diagram of a wireless communication transformer winding deformation frequency response method detection and computing system according to a specific embodiment of the present invention;

FIG. 2 is a flowchart of a wireless communication transformer winding deformation frequency response method detection and calculation method according to a specific embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for the purpose of this thorough and complete disclosure invention, and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the invention. In the drawings, the same elements/elements are given the same reference numerals.

Unless otherwise defined, terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is to be understood that terms defined in commonly used dictionaries should be construed as having meanings consistent with the context in the related art, and should not be construed as idealized or overly formal meanings.

1 is a structural diagram of a wireless communication transformer winding deformation frequency response method detection and computing system according to a specific embodiment of the present invention; as shown in FIG. 1 , the system includes:

The upper computer control unit 110 and the lower computer detection unit 120; the upper computer control unit 110 includes the upper computer instruction module 111 and the upper computer wireless communication module 112; the lower computer detection unit 120 includes the lower computer wireless communication module 121, frequency sweep a signal generation module 122, a signal processing module 123 and a signal calculation module 124;

In order to avoid the problem of signal attenuation and distortion caused by too large signal transmission distance, the accuracy of the signal is ensured through the wireless communication between the upper computer and the lower computer; in this embodiment, the detection unit 120 of the lower computer is connected to the The detection transformer winding load is connected, and information exchange is realized with the host computer through wireless communication, which solves the detection accuracy problem in the prior art.

The host computer command module 111 is used to receive the user's control request information and convert it into a preset host computer command; the host computer command unit is connected with the host computer wireless communication module 112; the host computer command module 111 The upper computer instruction is sent to the lower computer detection unit 120 through the upper computer wireless communication module 112; the upper computer instruction includes frequency sweep signal information;

In this embodiment, the frequency sweep signal information includes the frequency sweep signal information including the signal peak value, the frequency sweep start frequency, the frequency sweep cutoff frequency, the frequency sweep mode, and the frequency sweep point number;

The upper computer instruction also includes filtering control information;

The command format can be:

VPP=XX, BP=T(F), F1=XXXX.X, F2=XXXX.X, N=XXXX, SM=LIN(LOG )

in:

1) VPP is the peak-to-peak value of the output sine signal, unit: V, adjustable from 05V to 20V, accuracy: 1V;

2) F1 is the starting frequency, unit: kHz, adjustable from 0.1kHz to 2000kHz;

3) F2 is the cut-off frequency, unit: kHz, adjustable from 0.1kHz to 2000kHz;

4) N is the number of frequency sweep points, unit: pcs.

5) SM is frequency sweep mode, including linear frequency sweep mode and logarithmic frequency sweep mode, SM=LIN is linear frequency sweep, SM=LOG is logarithmic frequency sweep.

6) BP is the band-pass filter function, BP=T means the band-pass filter is turned on, BP=F means the band-pass filter is turned off, the default is off;

The signal peak value, frequency sweep start frequency, frequency sweep mode and frequency sweep cut-off frequency are determined by receiving the control request information determined by the user in the corresponding preset parameter interval, that is, the user can only input the parameters in the preset interval. Generate host computer commands.

The host computer instruction module 111 is used to determine the frequency array according to the frequency sweep start frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the number of frequency sweep points;

The frequency sweep signal generating module 122 sequentially generates the frequency sweep signal according to the frequency values in the frequency array;

When the frequency sweep mode is a linear frequency sweep mode, the calculation mode of the frequency array is:

When the frequency sweep mode is a logarithmic frequency sweep mode, the calculation mode of the frequency array is:

Among them, f ₂ is the cut-off frequency of the sweep, f ₁ is the start frequency of the sweep, N is the number of sweep points, i is the number of sweeps, i=0, 1, 2...N-1.

For example: f ₁ =1, f ₂ =10, N=10, the linear sweep array is: (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) kHz; the log sweep array is: (1, 1.3, 1.7, 2.2, 2.8, 3.6, 4.6, 6.0, 7.7, 10.0) kHz.

The upper computer wireless communication module 112 and the lower computer wireless communication module 121 are used to establish a communication channel for data transmission through a preset wireless communication protocol;

The output end of the frequency sweep signal generating module 122 is connected to the input end of the transformer winding load to be detected; the input end of the signal processing module 123 is connected to the output end of the transformer winding load to be detected;

The frequency sweep signal generating module 122 obtains the frequency sweep signal information in the command of the upper computer through the lower computer wireless communication module 121, generates the frequency sweep signal according to the frequency sweep signal information and outputs it to the transformer winding load;

In this embodiment, the frequency sweep signal generating module 122 is configured to generate a sinusoidal frequency sweep signal point by frequency point according to the frequency array, and send the signal into the load network. The parameters of the sinusoidal signal are: frequency range 100Hz-2MHz; frequency sweep step size 500Hz, the accuracy of each frequency point should not be greater than 0.01%; no-load voltage peak-to-peak value: adjustable from 1Vpp to 20Vpp, step size 1Vpp, voltage peak value at each frequency point The absolute error between the peak value and the preset value is not more than 1% of the preset voltage peak-to-peak value; the output impedance is 50Ω.

The signal processing module 123 has two input terminals, which are respectively connected with the two output terminals of the transformer winding load to be detected;

The signal processing module 123 is used to preprocess the two output signals of the transformer winding load to be detected according to preset rules, and transmit the preprocessed two output signals to the signal calculation module. the input terminal;

In this embodiment, the signal processing module 123 includes a band-pass filtering sub-module 1231 and an AD acquisition sub-module 1232;

The band-pass filtering sub-module 1231 is used to filter the two output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands to obtain the filtered two output signals;

The AD acquisition sub-module 1232 is used to perform AD conversion on the filtered output signal to obtain two digital output signals.

In this embodiment, the main parameters of the AD acquisition sub-module 1232 may be:

1) The sampling rate is automatically adjusted to 1MS/s and 20MS/s.

2) Resolution: 12bit.

3) Sampling storage depth: 1kHz ~ 2MHz sinusoidal signal single sampling 4 cycles.

4) Trigger mode: no trigger, automatic acquisition after receiving the command.

5) Coupling mode: AC.

Further, the upper computer instruction includes filtering control information; the bandpass filtering sub-module 1231 is used to determine whether to perform bandpass filtering according to the filtering control information; if it is determined not to perform bandpass filtering, the original The two output signals are transmitted to the AD acquisition sub-module 1232 .

As shown in the above example, BP is the band-pass filter function, BP=T, the band-pass filter is turned on, and BP=F, the band-pass filter is turned off, and the default is off;

Further, the signal processing module 123 further includes a range adjustment sub-module 1233;

The range adjustment sub-module 1233 is used to judge whether the acquisition range of the search output signal needs to be adjusted according to the preset judgment method;

The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset ratio range of the current range, range adjustment is not required; if the signal peak value is high If the peak value of the signal is lower than the preset ratio range of the current range, the range is lowered according to the preset ratio.

The signal calculation module 124 is configured to calculate and obtain detection parameters according to the two input signals and preset rules, and upload the detection parameters to the upper computer control unit 110 through the lower computer wireless communication module 121;

The signal calculation module 124 calculates the detection parameters including amplitude-frequency parameters and phase-frequency parameters;

The calculation formula of the amplitude-frequency parameter H is:

H=20lg(V ₂ /V ₁ )

The calculation formula of the phase-frequency parameter C is:

C=θ ₂ -θ ₁

Among them, H is the amplitude-frequency parameter; V ₁ is the peak-to-peak value of the waveform collected by the first channel; V ₂ is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ ₁ is the waveform collected by the first channel. Initial phase; θ ₂ is the initial phase of the waveform collected by the second channel.

The upper computer control unit 110 is configured to analyze the detection parameter according to a preset analysis method, and obtain the detection result of the transformer winding deformation.

Further, the lower computer detection unit 120 further includes a storage module 125 and a process control module 126;

The storage module 125 is configured to associate and store the detection parameters and the current frequency calculated by the signal calculation module 124;

The process control module 126 is used for judging whether the frequency sweeping process is over according to the current frequency and the frequency sweeping cut-off frequency; when judging that the frequency sweeping process is over, uploading multiple sets of detection parameters stored in the storage module 125 together to the host computer control unit 110;

The process control module 126 is used to generate a process instruction after calculating and obtaining each set of detection parameters; when the frequency sweep process is not over, the process instruction includes the current frequency value; when the frequency sweep process ends, all The process command is a preset process command that represents the end of the frequency sweep;

In this embodiment, the process instructions may be three types:

1) None. The normal execution process of the lower computer

2) STOP=F. The lower computer uploads the current frequency, and the upload format is F=XXXX.X

3) STOP=T. When the frequency sweeping process is over, the lower computer enters the sleep mode;

in this example. After judging that the cut-off frequency is reached, the host computer control unit 110 receives a plurality of sets of inspection parameters after receiving a process instruction representing the end of the frequency sweep. specific:

Upload the frequency points H and C stored in the memory to the host computer, and clear the memory after uploading. The upload command is: READ BUFFER, the data format uploaded by the lower computer is H1, H2, H3... Hn; C1, C2, C3... Cn; -T(F)(H1, H2, H3... Hn is each frequency point Amplitude and frequency calculation results. C1, C2, C3...Cn are the phase frequency calculation results of each frequency point. -T(F) is the check code, if the signal of each frequency point does not exceed the maximum range, the check code is T ; If some frequency signals exceed the maximum range, the check code is F). If the frequency sweep process is not over, the next frequency signal generation, acquisition, calculation and storage operations are performed. If the host computer gives: READ BUFFER during this process, it will return empty data.

FIG. 2 is a flowchart of a wireless communication transformer winding deformation frequency response method detection and calculation method according to a specific embodiment of the present invention. As shown in Figure 2, the method includes:

Step 210, receiving the control request information of the user, and generating a host computer instruction; the host computer instruction includes the frequency sweep signal information;

Further, the frequency sweep signal information includes the frequency sweep signal information including the signal peak value, the frequency sweep start frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the number of frequency sweep points;

The signal peak value, the frequency sweep start frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control request information determined by the user within the corresponding preset parameter interval.

Further, the frequency array is determined according to the frequency sweep start frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the number of frequency sweep points; the frequency sweep mode includes a linear frequency sweep mode and a logarithmic frequency sweep mode;

The frequency sweep signal is sequentially generated according to the frequency values in the frequency array;

When the frequency sweep mode is a linear frequency sweep mode, the calculation mode of the frequency array is:

When the frequency sweep mode is a logarithmic frequency sweep mode, the calculation mode of the frequency array is:

Among them, f ₂ is the cut-off frequency of the sweep, f ₁ is the start frequency of the sweep, N is the number of sweep points, i is the number of sweeps, i=0, 1, 2...N-1.

Step 220, transmitting the upper computer command to the lower computer detection unit through a wireless communication method; generating a frequency sweep signal through the frequency sweep signal information of the upper computer command and outputting it to the transformer winding load;

Step 230: Collect two output signals of the transformer winding load to be detected, preprocess the two output signals, and obtain the preprocessed two output signals;

Further, preprocessing the two output signals to obtain the preprocessed two output signals, including:

Filtering the two output signals of the transformer winding load to be detected according to one or more preset filter frequency bands to obtain filtered two output signals;

AD conversion is performed on the filtered output signal to obtain two digital output signals.

Further, preprocessing the two output signals also includes:

The host computer instruction includes filtering control information;

Whether to perform band-pass filtering is determined according to the filtering control information; if it is determined not to perform band-pass filtering, the original two-channel output signals are substituted for the filtered two-channel output signals.

Further, according to the preset judgment method, it is judged whether the acquisition range of the search output signal needs to be adjusted;

The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset ratio range of the current range, range adjustment is not required; if the signal peak value is high If the peak value of the signal is lower than the preset ratio range of the current range, the range is lowered according to the preset ratio.

Step 240, calculating and obtaining the detection parameters according to the preprocessed two-way output signals and calculating the preset rules;

Further, the detection parameters include amplitude-frequency parameters and phase-frequency parameters;

The calculation formula of the amplitude-frequency parameter H is:

H=20lg(V ₂ /V ₁ )

The calculation formula of the phase-frequency parameter C is:

C=θ ₂ -θ ₁

Among them, H is the amplitude-frequency parameter; V ₁ is the peak-to-peak value of the waveform collected by the first channel; V ₂ is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ ₁ is the waveform collected by the first channel. Initial phase; θ ₂ is the initial phase of the waveform collected by the second channel.

Step 250 , upload the detection parameters to the host computer control unit through a wireless communication method; analyze the detection parameters according to a preset analysis method, and obtain the transformer winding deformation detection result.

Further, the detection parameters and the current frequency are associated and stored;

According to the current frequency and the frequency sweep cut-off frequency, determine whether the frequency sweeping process is over; when judging that the frequency sweeping process is over, upload the stored multiple sets of detection parameters to the host computer control unit together;

After calculating and obtaining each set of detection parameters, a progress command is generated; when the frequency sweep process is not over, the progress command includes the current frequency value; when the frequency sweep process ends, the progress command is a preset representative The process command for the end of the sweep.

In the description provided herein, numerous specific details are set forth. It will be understood, however, that embodiments of the present disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Those skilled in the art will understand that the modules in the device in the embodiment can be adaptively changed and arranged in one or more devices different from the embodiment. The modules or units or components in the embodiments may be combined into one module or unit or component, and further they may be divided into multiple sub-modules or sub-units or sub-assemblies. All features disclosed in this specification (including accompanying claims, abstract and drawings) and any method so disclosed may be employed in any combination, unless at least some of such features and/or procedures or elements are mutually exclusive. All processes or units of equipment are combined. Each feature disclosed in this specification (including accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. The step numbers involved in this specification are only used to distinguish each step, but not to limit the time or logical relationship between the steps. Unless clearly defined in the text, the relationship between the various steps includes various possible Happening.

Furthermore, those skilled in the art will appreciate that although some of the embodiments described herein include certain features, but not others, included in other embodiments, that combinations of features of different embodiments are intended to be within the scope of the present disclosure within and form different embodiments. For example, any of the embodiments claimed in the claims may be used in any combination.

Various component embodiments of the present disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure can also be implemented as an apparatus or system program (eg, computer programs and computer program products) for performing some or all of the methods described herein. Such a program implementing the present disclosure may be stored on a computer-readable medium, or may be in the form of one or more signals. Such signals may be downloaded from Internet sites, or provided on carrier signals, or in any other form.

It should be noted that the above-described embodiments illustrate rather than limit the disclosure, and that alternative embodiments may be devised by those skilled in the art without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present disclosure may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claim enumerating several systems, several of these systems can be embodied by one and the same item of hardware.

The above are only specific embodiments of the present disclosure. It should be pointed out that for those skilled in the art, several improvements, modifications, and variations can be made without departing from the spirit of the present disclosure. These improvements, Modifications and deformations should be regarded as falling within the protection scope of the present application.

Claims (16)

1. a transformer winding deformation frequency response method detection computing system of wireless communication, is characterized in that, described system comprises: The upper computer control unit and the lower computer detection unit; the upper computer control unit includes the upper computer command module and the upper computer wireless communication module; the lower computer detection unit includes the lower computer wireless communication module, the frequency sweep signal generation module, and the signal processing module and signal calculation module; The host computer command module is used to receive the user's control request information and convert it into a preset host computer command; the host computer command unit is connected with the host computer wireless communication module; the host computer command module passes the The upper computer wireless communication module sends the upper computer instruction to the lower computer detection unit; the upper computer instruction includes frequency sweep signal information; The upper computer wireless communication module and the lower computer wireless communication module are used to establish a communication channel for data transmission through a preset wireless communication protocol; The output end of the frequency sweep signal generating module is connected to the input end of the transformer winding load to be detected; the input end of the signal processing module is connected to the output end of the transformer winding load to be detected; The frequency sweep signal generating module obtains the frequency sweep signal information in the command of the upper computer through the wireless communication module of the lower computer, generates the frequency sweep signal according to the frequency sweep signal information and outputs it to the transformer winding load; The signal processing module has two input ends, which are respectively connected with the two output ends of the transformer winding load to be detected; The signal processing module is used to preprocess the two output signals of the transformer winding load to be detected according to a preset rule, and transmit the preprocessed two output signals to the signal calculation module. input; The signal calculation module is used to calculate and obtain detection parameters according to the two input signals and preset rules, and upload the detection parameters to the upper computer control unit through the lower computer wireless communication module; The upper computer control unit is configured to analyze the detection parameter according to a preset analysis method, and obtain the detection result of the transformer winding deformation. 2. system according to claim 1, is characterized in that: described frequency sweep signal information comprises frequency sweep signal information and comprises signal peak value, frequency sweep start frequency, frequency sweep cut-off frequency, frequency sweep mode and frequency sweep point number; The signal peak value, the frequency sweep start frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control request information determined by the user within the corresponding preset parameter interval. 3. system according to claim 2, is characterized in that: described frequency sweep mode comprises linear frequency sweep mode and logarithmic frequency sweep mode; The host computer instruction module is used to determine the frequency array according to the frequency sweep start frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the number of frequency sweep points; The frequency sweep signal generating module sequentially generates the frequency sweep signal according to the frequency values in the frequency array; When the frequency sweep mode is a linear frequency sweep mode, the calculation mode of the frequency array is:

When the frequency sweep mode is a logarithmic frequency sweep mode, the calculation mode of the frequency array is:

Among them, f ₂ is the cut-off frequency of the sweep, f ₁ is the start frequency of the sweep, N is the number of sweep points, i is the number of sweeps, i=0, 1, 2...N-1. 4. system according to claim 1, is characterized in that: described signal processing module comprises band-pass filter submodule and AD acquisition submodule; The band-pass filtering sub-module is used to filter the two output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands, and obtain the filtered two output signals; The AD acquisition sub-module is used to perform AD conversion on the filtered output signal to obtain two digital output signals. 5. The system of claim 4, wherein: The upper computer instruction includes filtering control information; the band-pass filtering sub-module is used to determine whether to perform band-pass filtering according to the filtering control information; if it is determined not to perform band-pass filtering, the original two-channel output signal is It is transmitted to the AD acquisition sub-module. 6. The system according to claim 4, wherein the signal processing module further comprises a range adjustment sub-module; The range adjustment sub-module is used for judging whether the acquisition range of the search output signal needs to be adjusted according to a preset judgment method; The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset ratio range of the current range, range adjustment is not required; if the signal peak value is high If the peak value of the signal is lower than the preset ratio range of the current range, the range is lowered according to the preset ratio. 7. The system according to claim 1, wherein: the detection parameters calculated by the signal calculation module include an amplitude-frequency parameter and a phase-frequency parameter; The calculation formula of the amplitude-frequency parameter H is: H=20lg(V ₂ /V ₁ ) The calculation formula of the phase-frequency parameter C is: C=θ ₂ -θ ₁ Among them, H is the amplitude-frequency parameter; V ₁ is the peak-to-peak value of the waveform collected by the first channel; V ₂ is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ ₁ is the waveform collected by the first channel. Initial phase; θ ₂ is the initial phase of the waveform collected by the second channel. 8. The system according to claim 1, wherein: the lower computer detection unit further comprises a storage module and a process control module; The storage module is configured to associate and store the detection parameter and the current frequency calculated by the signal calculation module; The process control module is used for judging whether the frequency sweeping process ends according to the current frequency and the frequency sweeping cut-off frequency; when judging that the frequency sweeping process ends, uploading multiple sets of detection parameters stored in the storage module to the upper machine control unit; The process control module is used to generate a process instruction after calculating and obtaining each set of detection parameters; when the frequency sweep process is not over, the process instruction includes the current frequency value; when the frequency sweep process ends, the process instruction The process command is a preset process command representing the end of the frequency sweep; After the upper computer control unit receives the process instruction representing the end of the frequency sweep, it receives multiple sets of inspection parameters. 9. A transformer winding deformation frequency response detection and calculation method for wireless communication, wherein the method comprises: Receive the user's control request information, and generate a host computer command; the host computer command includes frequency sweep signal information; The upper computer command is transmitted to the lower computer detection unit through a wireless communication method; the frequency sweep signal is generated by the frequency sweep signal information of the upper computer command and output to the transformer winding load; Collecting the two output signals of the transformer winding load to be detected, preprocessing the two output signals, and obtaining the preprocessed two output signals; Calculation and acquisition according to the preprocessed two-way output signals and calculation and acquisition of detection parameters according to preset rules; The detection parameters are uploaded to the host computer control unit through a wireless communication method; the detection parameters are analyzed according to a preset analysis method to obtain the transformer winding deformation detection results. 10. The method according to claim 9, wherein: the frequency sweep signal information comprises the frequency sweep signal information including signal peak value, frequency sweep start frequency, frequency sweep cut-off frequency, frequency sweep mode and frequency sweep point number; The signal peak value, the frequency sweep start frequency, the frequency sweep mode and the frequency sweep cut-off frequency are determined by receiving control request information determined by the user within the corresponding preset parameter interval. 11. The method of claim 10, wherein: Determine the frequency array according to the frequency sweep start frequency, the frequency sweep cut-off frequency, the frequency sweep mode and the number of frequency sweep points; the frequency sweep mode includes a linear frequency sweep mode and a logarithmic frequency sweep mode; The frequency sweep signal is sequentially generated according to the frequency values in the frequency array; When the frequency sweep mode is a linear frequency sweep mode, the calculation mode of the frequency array is:

When the frequency sweep mode is a logarithmic frequency sweep mode, the calculation mode of the frequency array is:

Among them, f ₂ is the cut-off frequency of the sweep, f ₁ is the start frequency of the sweep, N is the number of sweep points, i is the number of sweeps, i=0, 1, 2...N-1. 12. The system according to claim 9, wherein the two-way output signals are preprocessed to obtain the pre-processed two-way output signals, comprising: The band-pass filtering sub-module is used to filter the two output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands, and obtain the filtered two output signals; The AD acquisition sub-module is used to perform AD conversion on the filtered output signal to obtain two digital output signals. 13. The method according to claim 12, wherein preprocessing the two output signals further comprises: The host computer instruction includes filtering control information; Whether to perform band-pass filtering is determined according to the filtering control information; if it is determined not to perform band-pass filtering, the original two-channel output signals are substituted for the filtered two-channel output signals. 14. The method of claim 12, wherein: Determine whether the acquisition range of the search output signal needs to be adjusted according to the preset judgment method; The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset ratio range of the current range, range adjustment is not required; if the signal peak value is high If the peak value of the signal is lower than the preset ratio range of the current range, the range is lowered according to the preset ratio. 15. The method according to claim 9, wherein the detection parameters include amplitude-frequency parameters and phase-frequency parameters; The calculation formula of the amplitude-frequency parameter H is: H=20lg(V ₂ /V ₁ ) The calculation formula of the phase-frequency parameter C is: C=θ ₂ -θ ₁ Among them, H is the amplitude-frequency parameter; V ₁ is the peak-to-peak value of the waveform collected by the first channel; V ₂ is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ ₁ is the waveform collected by the first channel. Initial phase; θ ₂ is the initial phase of the waveform collected by the second channel. 16. The method of claim 9, wherein: The detection parameters and the current frequency calculated by the signal calculation module are associated and stored; According to the current frequency and the frequency sweep cut-off frequency, determine whether the frequency sweeping process is over; when judging that the frequency sweeping process is over, upload the multiple sets of detection parameters stored in the storage module to the host computer control unit together; After calculating and obtaining each set of detection parameters, a progress command is generated; when the frequency sweep process is not over, the progress command includes the current frequency value; when the frequency sweep process ends, the progress command is a preset representative The process command for the end of the sweep.

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